If you get the error PHP Fatal error: Call to undefined function Piwik\\Plugins\\CoreAdminHome\\imagecreatefrompng() it means that you need to install the GD extension for PHP. The GD extension is required for Piwik to generate report graphs, generate sparklines graphs, as well as to upload a custom logo. To check whether the GD extension is installed on your server, go to Piwik > Administration > System Check.

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